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jpayne@69
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1 /* Class autosprintf - formatted output to an ostream.
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2 Copyright (C) 2002, 2012-2016 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU Lesser General Public License as published by
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6 the Free Software Foundation; either version 2.1 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU Lesser General Public License for more details.
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13
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14 You should have received a copy of the GNU Lesser General Public License
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15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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16
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17 #ifndef _AUTOSPRINTF_H
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18 #define _AUTOSPRINTF_H
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19
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20 /* This feature is available in gcc versions 2.5 and later. */
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21 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
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22 # define _AUTOSPRINTF_ATTRIBUTE_FORMAT() /* empty */
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23 #else
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24 /* The __-protected variants of 'format' and 'printf' attributes
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25 are accepted by gcc versions 2.6.4 (effectively 2.7) and later. */
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26 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
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27 # define _AUTOSPRINTF_ATTRIBUTE_FORMAT() \
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28 __attribute__ ((__format__ (__printf__, 2, 3)))
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29 # else
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30 # define _AUTOSPRINTF_ATTRIBUTE_FORMAT() \
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31 __attribute__ ((format (printf, 2, 3)))
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32 # endif
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33 #endif
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34
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35 #include <string>
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36 #include <iostream>
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37
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38 namespace gnu
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39 {
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40 /* A temporary object, usually allocated on the stack, representing
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41 the result of an asprintf() call. */
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42 class autosprintf
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43 {
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44 public:
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45 /* Constructor: takes a format string and the printf arguments. */
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46 autosprintf (const char *format, ...)
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47 _AUTOSPRINTF_ATTRIBUTE_FORMAT();
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48 /* Copy constructor. */
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49 autosprintf (const autosprintf& src);
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50 /* Assignment operator. */
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51 autosprintf& operator = (autosprintf temporary);
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52 /* Destructor: frees the temporarily allocated string. */
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53 ~autosprintf ();
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54 /* Conversion to string. */
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55 operator char * () const;
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56 operator std::string () const;
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57 /* Output to an ostream. */
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58 friend inline std::ostream& operator<< (std::ostream& stream, const autosprintf& tmp)
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59 {
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60 stream << (tmp.str ? tmp.str : "(error in autosprintf)");
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61 return stream;
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62 }
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63 private:
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64 char *str;
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65 };
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66 }
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67
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68 #endif /* _AUTOSPRINTF_H */
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